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參數(shù)資料
| 型號(hào)： | RX78K4 |
| 英文描述： | 78K/IV Series Real-Time OS Fundamental | User＇s Manual[01/1997] |
| 中文描述： | 78K/IV系列實(shí)時(shí)操作系統(tǒng)的基本|用戶手冊(cè)[01/1997] |
| 文件頁(yè)數(shù)： | 86/96頁(yè) |
| 文件大?。?/td> | 265K |
| 代理商： | RX78K4 |
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77
APPENDIX 5 ESTIMATING MEMORY CAPACITY (LARGE MODEL)
On RX78K/IV, it is possible to set an area capable of generating objects (TCB, event flag, semaphore, mail box,
memory pool, and cyclic handler) in an arbitrary area. However, the area of 20 bytes starting from the start address
of the user-set area is an OS management area. Each object management area is secured from there on. Then the
12 bytes to 64 bytes ready queue area is secured. The ready queue area varies depending on the specified number
of task priorities. Each object can be generated in up to 255 units.
Calculation of the object size (data) for a system running RX78K/IV is shown below.
Example
Where number of objects to be created is:
Task
Semaphore
Cyclic handler : 2
Memory pool
: 20
: 4
Event flag
Mail box
: 5
: 3
: 2 (number of memory blocks: 5, size of 1 memory block: 16 bytes)
(number of memory blocks:10, size of 1 memory block: 32 bytes)
The task priority can be used up to 10 levels.
The top address (objhead) of the OS management area shall be 0FF700H.
RAM size used
OS
management
table
Ready
queue
TCB
Event flag
Semaphore
Mail box
Cyclic
handler
p
p
p
p
p
p
p
p
228 (bytes)
=
20
ò
4
u
10
ò
10
u
10
ò
4
u
5
ò
4
u
4
ò
4
u
3
ò
10
u
2
RAM size used
Memory pool
p
p
408 (bytes)
=
4
ò
16
u
5
ò
4
ò
32
u
10
Total
228
ò
408 = 636 (bytes)
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